Children of a convicted double murderer share how they grew up believing their mother committed suicide before discovering their father had killed her and another victim, covering up the murders for nearly 20 years.

Colin Howell's children Lauren, Daniel, and Jon spent 18 years believing their mother Lesley Howell died in a suicide pact in May 1991 before discovering in 2008 that their father and his lover Hazel Stewart had murdered her and police officer Trevor Buchanan in Castlerock, County Londonderry.